National Geographic - Down To The Earths Core: Take a journey from the footpath to the centre of the planet in one epic unbroken step, smashing through more than 6,000 kilometres of solid rock to explore the hidden world beneath our feet. With its stirring soundtrack and commanding narration, its initially unclear whether this documentary is supposed to enlighten or terrorise. Beneath our feet lies our greatest enemy, it begins. Suddenly were falling down a coalmine in Americas Midwest, marvelling at the fossilised plants that cover the ceiling. To understand how they got there, we have to go back 300 million years - and, thanks to clever computer-generated footage, we can. What follows is an informative account of our very own journey to the centre of the earth via 6000 kilometres of rock.